Patent US4402290A successfully refreshed from Google Patents.
US4402290A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel injection pump
Assignee: Robert Bosch GmbH
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Filing: 1980-11-10
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Granted: 1983-09-06
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Expires: 2000-11-10
Abstract
Abstract A fuel injection pump is proposed which can be shut off by a magnetic valve if there is a danger of engine "cranking". The magnetic valve is triggered via a switch system in which one switch is actuatable with the adjusting lever of the injection pump, wherein the magnetic valve is furthermore controllable by the supply pump pressure.
Inventors
- 👤 Gerald Hofer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:26
CPC Classifications
F; F02; F02M; F02M63/00; F02M63/02; F02M63/0205; F02M63/0215; F02M41/00; F02M41/08; F02M41/10; F02M41/12; F02M41/123; F02M41/125; F02M41/126
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
130 words
A fuel injection pump for internal combustion engines comprising a supply pump arranged to generate an rpm-dependent fuel pressure, an adjusting lever arranged to preselect the rpm and an electrically actuatable valve positioned relative to a fuel line bore that communicates with a pump work chamber, at least one switch actuatable with the adjusting lever disposed in an electric line leading to said electrically actuatable valve, said electrically actuatable valve being controllable in accordance with the supply pump pressure whereby at an idling position of the adjusting lever and at an actual supply pump pressure which is larger than the supply pump pressure at the idling speed of the injection pump the injection of fuel is interrupted by closing said fuel line bore by means of said electrically actuatable valve.
Claim 2
Dependent Claim
130 words
A fuel injection pump for internal combustion engines comprising a supply pump arranged to generate an rpm-dependent fuel pressure, an adjusting lever arranged to preselect the rpm and an electrically actuatable valve positioned relative to a fuel line bore that communicates with a pump work chamber, at least one switch actuatable with the adjusting lever disposed in an electric line leading to said electrically actuatable valve, said electrically actuatable valve being controllable in accordance with the supply pump pressure whereby at an idling position of the adjusting lever and at an actual supply pump pressure which is larger than the supply pump pressure at the idling speed of the injection pump the injection of fuel is interrupted by closing said fuel line bore by means of said electrically actuatable valve.
Claim 3
Dependent Claim
82 words
A fuel injection pump as defined by claim 1, wherein at least two switches including first and second switches are disposed in parallel in an electric line and the first switch is open at a position of the adjusting lever corresponding to low rpm (idling rpm) but is closed at a position corresponding to a slightly higher rpm, while in contrast, the second switch is closed at idling rpm and is opened when the rpm and thus the fuel pressure are increasing.
Claim 4
Dependent Claim
31 words
A fuel injection pump as defined by claim 1, wherein the second switch is embodied as a fluid pressure switch, which is exposed to the fuel pressure of the supply pump.
Claim 5
Dependent Claim
43 words
A fuel injection pump as defined in claim 1, wherein an adjusting piston exposed to the supply pump pressure urges the electric valve in the closing direction and a spring and the electric actuation means urge the electric valve in the opening direction.
Claim 6
Dependent Claim
33 words
A fuel injection pump as defined by claim 1, wherein the switch which is actuatable with the adjusting lever is disposed as a travel switch between the gas pedal and the adjusting lever.
Claim 7
Dependent Claim
42 words
A fuel injection pump as defined by claim 5, wherein the switch is actuable on at an rpm corresponding to the adjusting lever position, which is lower than the rpm at which the supply pump pressure overcomes the force of the spring.
Claim 8
Dependent Claim
40 words
A fuel injection pump as defined by claim 1, wherein a supply pump driven with a pump piston is integrated in a housing of the injection pump and a large part of the pump housing is under supply pump pressure.
Claim 9
Dependent Claim
34 words
A fuel injection pump as defined by claim 1, wherein the electrically actuated valve is disposed in the fuel line between the supply pump and the pump work chamber of the fuel injection pump.
Claim 10
Dependent Claim
20 words
A fuel injection pump as defined by claim 1, wherein the electrically actuated valve is embodied as a magnetic valve.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-09-05 | 1987-03-07 | 1987-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-05 | 1991-03-07 | 1991-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-05 | 1995-03-07 | 1995-09-06 | $7700.00 | Window Closed / Lapsed |